While I'd be willing to bet this is due to some malware flag (as that pretty much always ends up being the case with IM provider X is censoring Y), I am baffled as to why people would consider it scandalous that a multi-billion dollar company who makes pretty much all of its revenue from selling intellectual property licenses might drop links conveyed using its free service to a site that is unabashedly one of the wo…
Forget the need for deep-packet inspection. If major web services stop users from linking to TPB and other sites, MPAA etc. will have accomplished their goals of restricting legitimate users' activities. Who else is going to follow their lead now?